SIM does not work in new 3G iPhone
I bought a 3G iPhone to use in place of the phone I have. I cannot afford the crazily priced plan, so I just figured I'd jailbreak it and continue to use my current AT&T SIM card.
So with OSX 10.5.6 and the latest iTunes, I used QuickPwn 2.2 and went through all those steps successfully, etc. My iPhone boots up fine, but after sticking in my SIM card, it claims that there is no network and I get no service.
Was there anything I did wrong? Anything more I need to do? Or are you just unable to use preexisting AT&T SIM cards with jailbroken iPhones?
Thank you in advance!